721419 has 4 divisors (see below), whose sum is σ = 961896. Its totient is φ = 480944.

The previous prime is 721397. The next prime is 721439. The reversal of 721419 is 914127.

721419 is nontrivially palindromic in base 16.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 914127 = 3 ⋅304709.

It is a cyclic number.

It is not a de Polignac number, because 721419 - 2⁵ = 721387 is a prime.

It is a super-2 number, since 2×721419² = 1040890747122, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (721439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120234 + ... + 120239.

It is an arithmetic number, because the mean of its divisors is an integer number (240474).

2⁷²¹⁴¹⁹ is an apocalyptic number.

721419 is a deficient number, since it is larger than the sum of its proper divisors (240477).

721419 is a wasteful number, since it uses less digits than its factorization.

721419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240476.

The product of its digits is 504, while the sum is 24.

The square root of 721419 is about 849.3638796182. The cubic root of 721419 is about 89.6869369711.

The spelling of 721419 in words is "seven hundred twenty-one thousand, four hundred nineteen".